/Engine/Source/Developer/ToolWidgets/Public/Filters/SBasicFilterBar.h
Set the check box state of the specified filter (in the filter drop down) and pin/unpin a filter widget on/from the filter bar. When a filter is pinned (was not already pinned), it is activated and deactivated when unpinned.
void SetFilterCheckState ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FFilterBase](API\Developer\ToolWidgets\Filters\FFilterBase)< FilterType >> & InFilter, ECheckBoxState InCheckState )